code: def test_progress_bar_fn(num_steps):
      return iter(range(num_steps))
  
file_path: probability/tensorflow_probability/python/experimental/mcmc/progress_bar_reducer_test.py
imports: from tensorflow_probability.python.experimental.mcmc import progress_bar_reducer
  from tensorflow_probability.python.experimental.mcmc.internal import test_fixtures
  from tensorflow_probability.python.experimental.mcmc.sample_fold import sample_fold
  from tensorflow_probability.python.internal import test_util
label_desc: Use image node_id 1 for calling a global function with example usage: test_progress_bar_fn(num_steps) and returns: iter